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210 down near Numbulwar?

Old 21st Jun 2014, 03:26
  #21 (permalink)  
 
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I am in full concurrence with Jaba, the ATSB should be ashamed to put the title "Investigation" on that piece of rubbish.

A brief commentary on the flight, some obscure reference to oil and manifold pressure, all summed up in total with this gem of a conclusion..

From the photographs provided by the operator (Figure 2), the ATSB assessed that a connecting rod appeared to have broken and separated from the crankshaft, resulting in a hole in the crankcase. This precipitated a catastrophic engine failure. The smoke entering the cockpit was likely to have been from burning oil.
Seems to me they've had a phone interview with the LAME, the pilot or passenger, and the CP, got 2 photos emailed to them, pulled the ATC tapes and called it a day.

Solid work gentlemen


edit: Apologies, the actual conclusion is this..

...
The object of a safety investigation is to identify and reduce safety-related risk. ATSB investigations determine and communicate the safety factors related to the transport safety matter being investigated.
...

About this report
Decisions regarding whether to conduct an investigation, and the scope of an investigation, are based on many factors, including the level of safety benefit likely to be obtained from an investigation. For this occurrence, a limited-scope, fact-gathering investigation was conducted in order to produce a short summary report, and allow for greater industry awareness of potential safety issues and possible safety actions.
Thank you, ATSB. You've just 'communicated' to us all and made us 'aware' that (if in fact it was the conrod that caused the initial failure in this case) by your 'determination' conrods can break, and this is a 'potential safety issue'..

Last edited by Hempy; 21st Jun 2014 at 03:55.
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Old 21st Jun 2014, 07:57
  #22 (permalink)  
 
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I doubt they used words from the CP. I know him, and I think he is far more astute than the reports words, so I really wonder what they got from where.
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Old 21st Jun 2014, 10:13
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[quote
From the photographs provided by the operator (Figure 2), the ATSB assessed that a connecting rod appeared to have broken and separated from the crankshaft, resulting in a hole in the crankcase. This precipitated a catastrophic engine failure. The smoke entering the cockpit was likely to have been from burning oil.
][/quote]
A bit semantic but, in my experience, the hole in the crankcase is usually caused by the portion of connecting rod which is still connected to the crankshaft while it is still rotating (momentarily) at 2000+ RPM. The portion of connecting rod which is 'separated' generally comes to a standstill with its piston inside its associated cylinder. If a big end cap comes off, the connecting rod would be unlikely to put a hole in the top of the crankcase.
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Old 21st Jun 2014, 11:28
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Engine manufacturer/type: Irrelevant
Pilot age/experience: Irrelevant
Gear/flap settings: Irrelevant
Examination into the prior days maintenance and the 'suggestion' of low altitude/high mp ops: Irrelevant
Commentary on:
- SE Charter ops over tiger country
- The value of a MAYDAY call on a remote CTAF v's Area frequency
- Survival factors..

..Irrelevant

There's not enough useful information in that thing to be of any use for even any sort of trend analysis. What a joke.
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Old 21st Jun 2014, 12:05
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Engine manufacturer/type: Irrelevant
Pilot age/experience: Irrelevant
Gear/flap settings: Irrelevant
Examination into the prior days maintenance and the 'suggestion' of low altitude/high mp ops: Irrelevant
Commentary on:
- SE Charter ops over tiger country
- The value of a MAYDAY call on a remote CTAF v's Area frequency
- Survival factors..

..Irrelevant

There's not enough useful information in that thing to be of any use for even any sort of trend analysis. What a joke.
Apart from the tiger country bit, Damn straight! ATSB you reading?
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Old 23rd Jun 2014, 08:25
  #26 (permalink)  
 
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Originally Posted by BlatantLiar View Post
Apart from the tiger country bit, Damn straight!
Fair cop, although tbh reading the "investigation", other than the fact he couldn't see anywhere to put it down from 4,500 where there weren't any trees, no one would know what the terrain enroute was like
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Old 23rd Jun 2014, 11:36
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O.K....

I'll add to the post.... Re the quote....
"93 Km west of Numbulwar Aerodrome, Northern Territories, but the aircraft impacted trees and caught fire."

Which one of the 'Northern Territories' Oi wonder.......

Probably just a 'typo' OI know....but where's the 'proof reading' by the original author..??

OOOAAA...

Orf to take me pills now.....
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Old 23rd Jun 2014, 13:23
  #28 (permalink)  
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Orf to take me pills now.....
Don`t forget the tot of single malt to wash `em down Griffo

Wonder if we can persuade Mac Job to take over the report writing again?
(Pity there isn`t an `oh how I wish` smilie)

I say again; Bring back the old Aviation Safety Digest!!
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Old 23rd Jun 2014, 14:34
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Thanks Pinks....

Perhaps I should have indicated my real disappointment with the current mob....

Quality of reporting, integrity, and therefore, credence.... Of said report....

No cheers here.....
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Old 26th Jun 2014, 11:10
  #30 (permalink)  
 
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Low rpm/high mp increases radial tension on piston rings reducing glazing and subsequently oil consumption.
Thanks for that gangsta. I've heard another along these lines - low mp high rpm can cause ring 'flutter' and that high mp will prevent this by the higher radial tension. Can you confirm / debunk this?

(I assume by flutter that the engine oracle I was speaking to meant the ring was somewhat 'loose' in the barrel which made it prone to a stop - start sort of motion within the cylinder groove. Just guessing, don't know how you'd ever investigate it)

Last edited by Lumps; 26th Jun 2014 at 11:11. Reason: Can't construct a sentence
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